Table 1 Patient characteristics, inflammatory response, type of surgery and outcomes

Age (years)

64.4 ± 14.3

63.5 ± 14.4

65.3 ± 13.8

0.27

Sex (male/ female)

200 (65.6 %)/105 (34.4 %)

86 (60.1 %)/57 (39.9 %)

114 (70.4 %)/48 (29.6 %)

0.07

APACHE II

19.7 ± 7.8

20.5 ± 8.7

18.95 ± 6.6

0.07

SAPS II

36.5 ± 17.1

37.9 ± 19.3

35.1 ± 13.9

0.13

Immunosuppression

36 (11.8 %)

18 (12.6 %)

18 (11.1 %)

0.72

Neutropenia on admission

14 (4.6 %)

7 (4.9 %)

7 (4.3 %)

1.00

HIV

37 (12.1 %)

19 (13.3 %)

18 (11.1 %)

0.60

Type of infection

Secondary peritonitis

140 (45.9 %)

71 (49.6 %)

69 (42.6 %)

0.09

Tertiary peritonitis

165 (54.1 %)

72 (50.4 %)

93 (57.4 %)

0.023

Inflammatory response on admission

Sepsis

27 (8.8 %)

11 (7.7 %)

16 (9.8 %)

0.85

Severe sepsis

32 (10.5 %)

15 (10.5 %)

17 (10.5 %)

1.00

Septic shock

204 (67 %)

89 (62.2 %)

115 (71.1 %)

0.006

Multi-organ failure

42 (13.7 %)

28 (19.5 %)

14 (8.6 %)

0.003

Surgery data

Urgent surgery

276 (90.5 %)

125 (87.4 %)

151 (93.2 %)

0.11

Percutaneous surgery

41 (13.5 %)

17 (11.8 %)

24 (14.8 %)

0.10

Laparoscopic surgery

10 (3.3 %)

4 (2.8 %)

6 (3.7 %)

0.28

Laparotomy surgery

231 (75.7 %)

112 (78.5 %)

119 (73.5 %)

0.12

Combined surgery

23 (7.5 %)

10 (6.9 %)

13 (8 %)

0.14

Number of drainages on ICU admission

2 ± 1.7

1.2 ± 1.7

2.3 ± 1.8

0.01

Outcomes

ARDS

121 (39.6 %)

55 (38.4 %)

66 (40.7 %)

0.85

On mechanical ventilation

279 (91.5 %)

130 (90.9 %)

149 (92 %)

0.83

Arterial lactate on admission (mmol · dL⁻¹)

4.3 ± 3.3

4.1 ± 3.9

5.3 ± 2.5

0.57

RRT

77 (25.2 %)

40 (28 %)

37 (22.8 %)

0.35

Total parenteral Nutrition needs (any time)

251 (82.3 %)

113 (79 %)

138 (85.2 %)

0.17

ICU stay (days)

19.8 ± 24.8

12.9 ± 14.2

22.3 ± 32.9

0.002

Hospital stay (days)

21.7 ± 30

17.6 ± 35.3

25.4 ± 26.5

0.031

In-hospital mortality

115 (38 %)

64 (45.1 %)

110 (31.7 %)

0.018